Table 5
Mean WD mass, mass domain (between brackets), and He enhancements in mass fraction determined by observations in GCs.
| GC ID | Observations | Models | He–WD | ||
| M WD | ΔY | MWD with Ycanonical | MWD with ΔY | ||
|
|
|||||
| NGC 6752 | 0.53 or 0.59 | 0.03 | 0.59 | [0.55–0.59] | No |
| [Fe/H] = –1.75 | Moehler et al. (2004) | Milone et al. (2013) | 0.57 | ||
|
|
|||||
| NGC 6121 | [0.50–0.59] – 0.53 | 0.02 | 0.57 | [0.55–0.57] | No |
| [Fe/H] = –1.15 | Kalirai et al. (2009) | Nardiello et al. (2015) | |||
|
|
|||||
| NGC 2808 | – | 0.15 | – | [0.46–0.59] | Yes |
| [Fe/H] = –1.15 | Milone et al. (2015b) | ||||
|
|
|||||
| ω Centauri | – | 0.14 | – | [0.47–0.62] | Yes at |
| [Fe/H] = –1.75 | King et al. (2012) | [Fe/H] = –1.15 | |||
Notes. Predictions from our models with Yini = Ycanonical and with He enhancements corresponding to observations for WD mass (mass domain and mean values). The last column lists the possibility of obtaining He-WD from single He-rich progenitors.
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